little_helpers/tikz/sketch-0.2.161/Doc/sketch/Definitions.html

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  56 <h3 class="section">3.3 Definitions</h3>
  57
  58 <p><a name="index-definition-335"></a>Definitions give names to <code>sketch</code> objects.  Definitions alone
  59 are benign.  A <code>sketch</code> input file consisting entirely of
  60 definitions will generate no drawing.  Only when definitions are
  61 <dfn>referenced</dfn> do they potentially lead to ink on the drawing.
  62
  63    <p>The intent of definitions is to make <code>sketch</code> code more concise
  64 and readable.  There is no input file employing definitions
  65 that could not be re-written without them.
  66
  67    <p>Definable objects include any result of an affine arithmetic
  68 expression (scalar, point, vector, or transform), any drawable
  69 object (dots, line, curve, polygon, block, sweep, put, repeat, or
  70 special), and option strings.  In addition, <dfn>tag definitions</dfn>,
  71 <a name="index-definition_002c-tag-336"></a><a name="index-tag-definition-337"></a>which have no associated object at all, allow the meaning of other
  72 definitions to be selected from a set of alternatives. Since tags may
  73 be defined (and undefined) in the command line of <code>sketch</code>, they
  74 can be an aid in the script-driven preparation of documents.
  75
  76 <ul class="menu">
  77 <li><a accesskey="1" href="Forms-of-definitions.html#Forms-of-definitions">Forms of definitions</a>:         Different defs for different purposes.
  78 <li><a accesskey="2" href="Forms-of-references.html#Forms-of-references">Forms of references</a>:          How references denote types.
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